Boiler temp

DavidP24

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bridgedino

Everyone will set their heating / hot water temp different. Not hot enough to scold and not cold enough that it's unpleasant. There's no right or wrong, only what suits each of us.

Hotter water at the bath when the heating is increased is because the same heated water in the boiler heating the radiators also heats the hot water.

dave030445

You will find the slower the flow of water out of the taps the water will be hotter because the water stays in the boiler longer.

Norman_Castle

DavidP24 wrote: »

Problem with the bath is more to do with anti scold feature, trying to find a setting that is hot enough so it does not need to add cold (no point paying to heat water that is then cooled).

If you have very hot water then reduce the temperature by adding cold water for a bath filled to the same depth the cost will probably be the same as you will be using hotter water but less of it.

lstar337

David, do you have a condensing boiler?

If so, you need to set the radiator water to as low as it will go while still heating the house. Some experimentation will be required, but the upshot is that the boiler will be kept in condensing mode (more efficient, therefore less gas used) due to the return water temperature being sub 55c.

If you don't have a condensing boiler then setting it hotter will result in the rooms warming quicker and the boiler being on less.

Hot water is up to your personal choice. If you have a water tank you will need to keep it around 60c to avoid legionella, but if you are on a combi then just set it to what you like. I don't have mine too hot because I don't want any accidental scolding incidents with our daughter.

lstar337

DavidP24 wrote: »

Of course but I do not get the hot water, it is cooled by some stupid sensor under the bath so I am paying for hot water but it is cooled before I can get it out.

You aren't losing anything, but if you don't like the device why don't you just take it out?

It doesn't sound any different to the safety switch in my thermostatic shower, so I expect you can tweak the temperature anyway.

Do you have a real need to fill the bath with scolding water?

nofoollikeold

The "sensor under the bath" is probably a thermostatic mixing valve (TMV). This has a hot water inlet, a cold water inlet and a hot water outlet. The outlet has a set maximum temperature, and if the temperature of the incoming hot water is higher than the set temperature, it adds cold water until the temperature comes down to the set temperature. So the heat you put into the hot water is not wasted, just less hot water is used.

Most TMVs are adjustable, although the recommended maximum set temperature for a bath is 46degrees, less in certain environments. You might be able to get someone to adjust the TMV under your bath, assuming that is actually what it is.

lstar337

DavidP24 wrote: »

However, the bath water is tepid at best and cold by the time the bath is half full.

It must be faulty then. Usually they just prevent scolding water from getting to the tap.

DavidP24 wrote: »

I am not able to remove devices,

How come?

DavidP24 wrote: »

I was hoping someone here could tell me the standard temperatures for the boiler, then I would work on the device under bath

There isn't really a standard. People just set it how they like.

Set it to a comfortable temperature using a hand basin and go from there.

Norman_Castle

DavidP24 wrote: »

I can see from the boiler that it is sending hot water but these devices are adding cold, so I am paying to heat water that comes out cold. I am not able to remove devices, I was hoping someone here could tell me the standard temperatures for the boiler, then I would work on the device under bath,

My boiler water temperature is set to maximum. My thermostatic shower mixer is set to 38 degrees which is fine for a shower although I haven't tried it for the bath.

My boiler is set to 77 degrees for the radiators and maximum for water. My bills are low. As advised by my installer the boiler firing at higher temperatures for shorter periods is more efficient the trickling out at a lower temperature. Is your water temperature set too low?


This says the temperature should be limited to 48 degrees
http://www.rospa.com/campaigns-fundraising/success/tmv/

If the water from the boiler is not hot enough the thermostatic valve might not work properly.
http://www.bristan.com/WebRoot/BristanNewDB/Shops/Bristan/MediaGallery/files/Thermostatic_mechanical_valve.pdf

Page 2.

southcoastrgi

Welcome to the world of a combi, the incoming water temp is cold so the flow rate goes down, 38d for a shower feels hot the same temp for a bath feels a lot cooler you can't compaire the two

macman

bridgedino wrote: »

Everyone will set their heating / hot water temp different. Not hot enough to scold and not cold enough that it's unpleasant. There's no right or wrong, only what suits each of us.

Hotter water at the bath when the heating is increased is because the same heated water in the boiler heating the radiators also heats the hot water.

No it doesn't, they are completely separate circuits, and all combi's allow you separate control of the temp on each circuit. When a combi receives a demand for hot water, the entire output goes to the hot water supply-none to the heating. You cannot heat and run hot water simultaneously.